Tree crops such as coffee, cocoa, and oil palm have been promoted for many years in Sierra Leone.
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book chapter
Nutritional effects of commercialization of a woman's crop: Irrigated rice in The Gambia
The Gambia (West Africa) had a population of approximately 0.75 million and a total agricultural cultivated area of only 1,850 square kilometers in 1987-88.
Nigeria and many other sub-Saharan countries are rinding that adoption of new high-yielding varieties is severely constrained by existing farm input supply and food-marketing systems.